$δ$-biased Josephson tunnel junctions

Details $δ$-biased Josephson tunnel junctions $δ$-biased Josephson tunnel junctions

2009-12-08

arxiv.org/abs/0912.1510v1

Physical Review B Volume: 81 Issue: 5 Article Number: 054506, 2010

Physics

Condensed Matter

Superconductivity

14 pages, 10 figures

Scientific paper

10.1103/PhysRevB.81.054506

The behavior of a long Josephson tunnel junction drastically depends on the distribution of the dc bias current. We investigate the case in which the bias current is fed in the central point of a one-dimensional junction. Such junction configuration has been recently used to detect the persistent currents circulating in a superconducting loop. Analytical and numerical results indicate that the presence of fractional vortices leads to remarkable differences from the conventional case of uniformly distributed dc bias current. The theoretical findings are supported by detailed measurements on a number of $\delta$-biased samples having different electrical and geometrical parameters.

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